2ErosionThe movement of sediments and other materials from one place to another.Water is an agent of erosion.
3DepositionProcess by which eroded material is dropped.
4RunoffWater that flows across the Earth’s surface is called runoff. The water does not soak into the ground or evaporate.
5Factors related to a stream’s ability to erode material SlopeLoadDischarge
6Factors related to a stream’s ability to erode material The steepness, or slope, of the land also determines runoff.Water moves quickly down steep slopes so it has little time to soak into the ground.Water moves more slowly down gentle slopes and across flat area, allowing time to soak into the ground
7Factors related to a stream’s ability to erode material Gravity is the attracting force that all objects have for one another. The greater the mass of an object the greater the forces of gravity.Water runs downhill because of gravity.When water runs down a slope it picks up speed. As speed increases so does it energy.Fast moving water carries more soil than slow moving water does.
8Deposition by Surface Water As water moves through a river system it loses some of its energy of motion. The water can no longer carry some of its sediment. As a result, sediment is deposited to the bottom of the stream.Sediment can be carried for long or short distances.Sediment that is deposited as water empties into an ocean or lake form a triangular or fan-shaped deposit called a delta.When river water empties from a mountain valley onto an open plain, the deposit is called an alluvial fan.
9Landforms created by streams CanyonsValleysFloodplainDeltaAlluvial fan